Mersen STXR120P05AN - The most popular range in the STX series offering, the Surge-Trap® Type 1 STXR meets requirements for UL1449 Fourth Edition and is ideal for the replacement of older surge arrestors. The STXR Series SPD feature TPMOV® technology inside making them the safest product available. With a small, compact design and line or load installation flexibility the STXR series is the perfect fit for branch panel and/or individual equipment protection., 120V, L-G, L-N, N-G, Single Phase, LED and Remote Audible Alarm Audible Alarm 50 kA per phase
Mersen

STXR120P05AN

Alternate Item Number: STXR120P05AN

UPC: 782001474300


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Overview

The Mersen Surge-Trap® Type 1 STXR120P05AN is a highly popular surge protection device (SPD) from the STX series, designed to meet UL1449 Fourth Edition requirements. This unit is an ideal replacement for older surge arrestors, offering enhanced safety and performance. At its core, the STXR Series SPD features Mersen's proprietary TPMOV® technology, ensuring the highest level of protection available. Its compact design allows for flexible installation, whether on the line or load side, making it perfectly suited for protecting branch panels and individual pieces of equipment. This specific model, STXR120P05AN, operates at 120V and provides protection for Line-to-Ground (L-G), Line-to-Neutral (L-N), and Neutral-to-Ground (N-G) paths in single-phase systems. It includes both LED status indication and a remote audible alarm for immediate notification of any operational changes. With a robust surge current rating of 50 kA per phase, it effectively safeguards sensitive electronics from transient voltage events. The UNSPSC code for this product is 39121610.
  • UL1449 Fourth Edition compliant Type 1 SPD
  • Features Mersen's TPMOV® technology for enhanced safety
  • Compact design with line or load installation flexibility
  • 120V, L-G, L-N, N-G protection for single-phase systems
  • Includes LED status indicator and remote audible alarm

Specifications

Application
Branch panel and/or individual equipment protection Commercial and Industrial Distribution Panels Control Panels
Brand Name
Mersen
Connection
Pre-wired
Connection
Pre-wired with 3 ft 12 AWG conductors
Connection Type
Line or Load Installation
Current Rating
50 kA
Frequency
50-60 Hz
Frequency Rating
50/60 HZ
Frequency Rating, Maximum
60 Hz
Frequency Rating, Minimum
50 Hz
Insulation
Polycarbonate
Material
TPMOV®
Material
Polycarbonate
Mounting
Panel Mount
Mounting Type
Branch Panel or Individual Equipment
Operating Temperature, Maximum
185 F
Operating Temperature, Maximum
85 C
Operating Temperature, Minimum
-40 F
Operating Temperature, Minimum
-40 C
Phase
1
Poles
L-G, L-N, N-G, Single Phase
Series
STXR
Short Circuit Rating
200 kA
Short-Circuit Rating
200 kA
Size
3.25 x 3.35 x 3.35;82.55 x 85.09 x 85.09 in;mm
Size
Compact
Special Features
Designed with industry leading Mersen TPMOV technology Optional mounting bracket for surface mount applications NEMA 4X enclosure for outdoor or indoor use Fits 3/4" knockouts with 3' leads for easy installation Up to 10 modes of Protection (L-N, L-L, L-G optional, N-G optional) Bright LED status indicator, visible from side profile through clear cover 5-year manufacturer’s warranty
Special Features
Designed with the industry leading Mersen TPMOV® Technology LED status indicator (ON = Good, OFF = Replace) NEMA 4X enclosure for outdoor or indoor use Fits 3/4" knockouts with 3' leads for easy installation Optional mounting bracket for surface mount applications Optional audible alarm and remote dry contacts For use in ANSI/UL Type 1 or 2 SPD installations Up to 10 modes of Protection (L-N, L-L, L-G optional, N-G optional) 5-year warranty
Standard
ANSI/UL 1449 5th Edition, Type 1 SPD, File E210793 CSA C22.2, Type 1 SPD ANSI/IEEE C62.41.1, C62.41.2, C62.45 UL96A Lightning Protection RoHS Compliant
Standard
ANSI/UL 1449 5th Edition, Type 1 SPD, File E210793 CSA C22.2, Type 1 SPD UL96A Lightning Protection RoHS Compliant
Type
NEMA UL CSA TYPE 1
Type of Indicators
LED and Remote Audible Alarm
Type Of Indicators
LED and Remote Audible Alarm Audible Alarm
UL SPD Type
Type 1
Voltage Rating
120 V
Package Weight (Imperial)
1.800 L
Package Weight (Metric)
0.816 kg
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
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How to Install the STXR120P05AN Surge Protective Device

This guide provides step-by-step instructions for installing the STXR120P05AN Surge Protective Device to protect your equipment from transient overvoltages.

Estimated time: 45m

Tools needed:

Screwdriver, Wire strippers, Multimeter

Supplies needed:

Mounting screws, Terminal connectors, Watertight fittings (if applicable)

  1. Turn off power

    Ensure all power supplying the equipment is turned off and confirm that all sources are de-energized before proceeding with the installation.

  2. Determine mounting location

    Select a mounting location for the SPD that is as close to the equipment as possible, ensuring that the LED status indicator will be visible. If using a breaker, identify its location (recommended size is 30A).

  3. Mount the SPD

    Securely mount the SPD to the designated location using appropriate mounting screws, ensuring it is level and firmly attached.

  4. Make electrical connections

    Connect the SPD according to the wiring diagram provided. Trim leads to the shortest length possible, avoiding loops or sharp bends to ensure optimal performance.

  5. Energize the system

    Turn the power back on and confirm the proper operation of the SPD by checking that the green LED status indicator is illuminated.

Frequently Asked Questions about Mersen

What industries and applications are Mersen products used for?

Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.

What are the main product lines offered by Mersen?

Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.

What are the key features of Mersen products?

Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.

What environmental ratings do Mersen products have?

Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.

What accessories are available for Mersen products?

Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.

How are Mersen products typically installed?

Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.

What certifications and standards do Mersen products comply with?

Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.

What technical support does Mersen offer?

Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.